package com.liu.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
 * 自定义zuul过滤器
 */
@Component
public class MyFilter extends ZuulFilter{
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);
    @Override
    public String filterType() {
        /**
         * filterType：返回一个字符串代表过滤器的类型，在zuul中定义了四种不同生命周期的过滤器类型，具体如下：
         * pre：路由之前
         * routing：路由之时
         * post： 路由之后
         * error：发送错误调用
         */
        return "pre";
    }

    @Override
    public int filterOrder() {
        /**
         * filterOrder：过滤的顺序
         */
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        /**
         * 这里可以写逻辑判断，是否要过滤，本文true,永远过滤。
         */
        return true;
    }

    /**
     * 过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问。
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();
        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
        if (request.getParameter("token") == null){
            log.warn("token is empty");
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(401);
            try {
                requestContext.getResponse().getWriter().write("token is empty");
            }catch (Exception e){}

            return null;
        }
        log.info("token不为空");
        return null;
    }
}
